unicap is a library to access different kinds of capture devices. Device drivers are loaded with a plugin system so that new drivers can be easily added. Currently, it has support for video-4-linux, video-4-linux-2, IIDC cameras, and video-to-firewire converters, and provides GTK widgets for live video display and access to device properties.
v4l-utils is a collection of various video4linux (V4L) and DVB utilities. libv4l is an accompanying collection of libraries that adds a thin abstraction layer on top of video4linux2 (V4L2) devices. The purpose of this layer is to make it easy for application writers to support a wide variety of devices without having to write separate code for different devices in the same class. It consists of 3 different libraries. libv4lconvert offers functions to convert from any (known) pixel format to V4l2_PIX_FMT_BGR24 or V4l2_PIX_FMT_YUV420. libv4l1 offers the (deprecated) v4l1 API on top of v4l2 devices, independent of the drivers for those devices supporting v4l1 compatibility (which many v4l2 drivers do not). libv4l2 offers the v4l2 API on top of v4l2 devices, while adding support for the application transparent libv4lconvert conversion where necessary.
vfp (video for Pascal) is a Freepascal interface to video4linux. This package contains the unit videodev.pas (similar to videodev.h) and an object-oriented version which supplies the different functionalities via plugins. vfp also supports special video cameras modified for long time integration. vfp is a subpackage of the SImg software.